On this Christmas season, Apple has published six free electronic books on Mac OS X and iOS development for free of cost. These books are previously seen with the Apple developers portal, but now Apple has released these books for free download to all its users. The six free books include Cocoa Fundamental’s Guide, The Objective-C Programming Language, iOS Application Programming Guide, Object Oriented Programming With Objective-C, iOS Technology Overview, and iOS Human Interface Guidelines.
All these books can be downloaded using iBooks on your iPhone, iPod Touch and the iPad.
[Via Cult of Mac]